Kerberos V5 (RFC 4120)

1. Protocol overview

   KDC, tickets, authenticators and the three-party model.

2. Authentication service exchange

   AS-REQ/AS-REP to obtain a ticket-granting ticket.

3. Ticket-granting service exchange

   TGS-REQ/TGS-REP to obtain service tickets.

4. Client/server authentication exchange

   AP-REQ/AP-REP between client and application server.

5. Principal names and realms

   Name types for principals and realm naming.

6. Pre-authentication

   PA-DATA and encrypted timestamp pre-authentication.

7. Message specifications

   ASN.1 definitions for tickets and messages.

8. Security considerations

   Replay caches, clock skew and password guessing.

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